Mold for cementitious material



SPt 19, 1950 w. E. ANDERSON 522,593

|aoLD FOR CEMENTITIOUS MATERIAL Filed July 29, 1946 llllllll/ Patented Sept. 19, 1950 MoLD non cEMEN'rITioUs MATERIAL William E. Anderson, Kansas City, Mo., assigner of one-half to William Earl Anderson, Blue Springs, Mo.

Application July 29, 1946, Serial No. 686,938

This invention relates to a, mold for forming cementitious blocks used in the construction of buildings or the like and includes a specially formed mold for forming blocks of a desired contour.

The primary object oi this invention is t@ provide a building block mold that is constructed from ilexible material and that is readily `collapsible, whereby rapid removal of the same from the nished block is made possible and whereupon the same mold may be used for immediately forming successive blocks.

An important Object of this invention is to provide a building block mold having a polygonal frame provided with open ends and plates covering the ends and overhanging all of the walls of the frame for supporting the material forming the .block and presenting a hollow, polygonal, nnished block having its ends open.

Another object of this invention is to provide in a building block of the aforementioned character, means inherent in said plates for preventing flexing of the frame thereof when the mold is in operative use, and quickly releasable means for mounting the frame and the plates in an assembled condition.

Many additional objects will become apparent during the course of the following specification, referring to the accompanying drawing, wherein:

Figure l is a top plan View of the apparatus for forming cementitious blocks made in accordance with the present invention, parts being broken away to reveal details of construction of the mold and the manner in Which cement is applied to the side walls thereof.

Fig, 2 is a substantially central longitudinal, cross sectional view of the mold per se, and

Fig. 3 is a vertical cross sectional view through the mold transversely to that shown in Fig. 2.

The mold or form for supporting the material utilized in making concrete building blocks is rclearly illustrated in Figs. 2 and 3 and is broadly designated by the numeral I0. A frame portion of the mold is illustrated as an open-end section having a pair of substantially parallel side Walls I2 and a pair of opposed end Walls I4. The open ends of the frame are closed by a bottom plate I6 and a top plate I8, each of which extends beyond the outermost faces of the side walls I2 and the end walls I4 a distance equal to the desired thickness of the block to be formed.

Interlocking structure between the plates I6 and I8 and the walls I2 and I4 includes a continuous strip 2B xed to one face of each plate I6 and I8 to circumscribe the walls I2 and I4 near the re- 4 Claims. (Cl. 25-121) tional blocks.

spective edges thereof. These strips 2t have a width equal to distance that the plates i6 and I8 overhang the walls I2 and I 4 to insure uniform thickness of all walls of the finished block.

Inward movement of the walls l2 and i4 is' prevented by additional strips 22 and 24 respectively on each of the plates I5 and I3, disposed within the frame consisting ofthe said walls I2 and lil when the mold is assembled, and cooper-y ate with the strips '20 in holding the entire structure together.

The entire mold I0 is made from hard rubber or other flexible material whereby the same may be removed from a finished block by removing the plate I3 and flexing the sides I2 or the ends I4 to remove the entire polygonal frame for reassembling and continued use in making addi- The material from which the plates I6 and I8 are formed is relatively rigid for cooperating with the interlocking structure comprising strips 2d, 22 and 24 in holding the walls I4 and It against flexing when in operative use.

Fig. 1 illustrates a number of the molds IIJ, just described on an endless conveyor 26,. the details of construction of which are not shown since it may take any of the conventional forms. This conveyor 26 moves between a series of opposed nozzles 28.

The nozzles 28 and structure associated therewith form no part of this invention with respect to detailed mechanism, but for purposes of explanation, the numeral 3Q indicates a housing for a motor and a fan driven thereby for creating pressure in a conduit 32 communicating with a source of comminuted material comprising the usual ingredients of sand and cement. As the material is forced through the nozzle 2B head 33 directs water under pressure against the material as it projects outwardly from the nozzle 28.

The molds I0 are disposed in end-to-end relation on the conveyor 26 in alignment with the concrete 34 emanating from the nozzles 28 whereby the concrete is applied with force to the sides I2 of the molds I0 as they successively pass through the streams of cement.

A series of trowels 36 is disposed along the path of travel of the molds I0 on each side thereof and as illustrated in Fig. 1 these trowels 36 are placed alternately between the nozzles 28. As the conveyor 26 moves the molds I0 past the nozzles 28, a layer of concrete 34 is sprayed on the walls I2 and I4 until the entire thickness of the iinished block walls is completed, that is, the space defined by the overhanging portions of the plates I 6 and I8. The trowels 3S are disposed to be in Substantial engagement with the longitudinal edges of the plates IS and I8 as the molds I0 are moved and any excess concrete is thereby removed and the outermost surfaces of the block smoothed to a finished condition. When the molds I0 pass the last nozzle 28 they are removed from the conveyor and nozzle assembly for forming the ends of the block in the same manner as above described. If the molds l0 are rectangular as illustrated, the only difference in the construction of such second conveyor assembly will be the distances at which opposed nozzles 2.8 yand trowels 36 are spaced apart. If the blocks are to be square, then the assemblies will be substantially identical.

The nal step, as above described consists in collapsing and removing the form I0 from the completed building block and placing the same at the point of beginning on the conveyor 26 for re-use in forming additional blocks.

It is realized of course that building block molds may be made and methods employed for using the same in a manner different from that set forth in this specication without departing from the spirit of the invention or scope of the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A mold for cementitious blocks comprising a polygonal, open end frame of flexible material; `o verlxanging plates closing the ends respectively of the said frame, said plates extending beyond the outermost periphery of the frame; and interlocking; quickly releasable structure on the frame and the plates for mounting the mold in an assembled condition, said interlocking structure comprisingv a continuous annular strip xed to each of saidV plates respectively exteriorly of said frame, and corresponding strips on the saidl plates Within said frame, said strips enclosing only' the proximal marginal edges of the frame.

2. A mold for cementitious material comprising a. 'exible, continuous frame having a pair of opposed open ends, a plate covering each open end respectively of the frame and separate therefrom;v said plates-extending beyond the outermost periphery of the frame; and means on each plate respectively for holding the Walls of the frame against inward movement, each plate having a continuous strip of material for receiving the proximal outermost marginal edge of the frame to hold the frame walls against outward movement.

3. A mold for cementitious material comprising a exible, continuous frame having a pair of opposed open ends, a plate covering each open end respectively of the frame and separate therefrom; said plates extending beyond the outermost periphery of the frame; and means on each plate respectively for holding the walls of the frame against inward movement, each plate having a continuous strip of material for receiving the proximal outermost marginal edge of the frame to hold the frame walls against outward movement, said strips each terminating at the outer peripheries thereof ush with the corre:- sponding plate.

4. A mold for cementitious material comprising a flexible, continuous frame having a pair of opposed open ends, a plate covering each open end respectively of the frame and separate therefrom; said plates extending beyond the outermost periphery of the frame; and means on each plate respectively for holding the walls of the frame against inward movement, each plate having a continuous strip of material for receiving the proximal outermost marginal edge of the frame to hold the frame walls against outward movement, said strips each terminating at the outer peripheries thereof flush with the corresponding plate, the distance between the strips being uniform throughout the lengths thereof.

WILLIAM E. ANDERSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,085,973 Conklingr Feb. 3, 1914 1,365,753 Vought Jan. 18, 1921 1,552,064 Lake Sept. 1, 1925 2,091,973 Fessler Sept. 7, 1937 2,234,784 Stolz Mar. 11, 1941 

